IUD taken out after 6 months, no period since ???

I got my IUD taken out 6 months after I had it put in because of pain and discomfort, shortly after I got a small light period for about 3-4 days and then it stopped. I am now a little over 50 days without a period and several negative pregnancy tests. No condom usage or birth control the last 50 days either. I talked to my Doctor when I got the IUD out and she said I should be having normal periods as soon as I got it taken out but that is not the case. Any ideas on what is going on or anyone with similar experiences? Any suggestions on what to do is appreciated. At first I thought pregnancy but every two-three weeks I take a test and it is negative. I’ve never had a baby before, I’m bloated, back pain and white gooey discharge.